<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * MySQL Utility Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {

/**
 * List databases
 *
 * @access	private
 * @return	bool
 */
  function _list_databases() {
    return "SHOW DATABASES";
  }

  // --------------------------------------------------------------------

  /**
   * Optimize table query
   *
   * Generates a platform-specific query so that a table can be optimized
   *
   * @access	private
   * @param	string	the table name
   * @return	object
   */
  function _optimize_table($table) {
    return "OPTIMIZE TABLE ".$this->db->_escape_identifiers($table);
  }

  // --------------------------------------------------------------------

  /**
   * Repair table query
   *
   * Generates a platform-specific query so that a table can be repaired
   *
   * @access	private
   * @param	string	the table name
   * @return	object
   */
  function _repair_table($table) {
    return "REPAIR TABLE ".$this->db->_escape_identifiers($table);
  }

  // --------------------------------------------------------------------
  /**
   * MySQL Export
   *
   * @access	private
   * @param	array	Preferences
   * @return	mixed
   */
  function _backup($params = array()) {
    if (count($params) == 0) {
      return FALSE;
    }

    // Extract the prefs for simplicity
    extract($params);

    // Build the output
    $output = '';
    foreach ((array)$tables as $table) {
    // Is the table in the "ignore" list?
      if (in_array($table, (array)$ignore, TRUE)) {
        continue;
      }

      // Get the table schema
      $query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.'.$table);

      // No result means the table name was invalid
      if ($query === FALSE) {
        continue;
      }

      // Write out the table schema
      $output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;

      if ($add_drop == TRUE) {
        $output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
      }

      $i = 0;
      $result = $query->result_array();
      foreach ($result[0] as $val) {
        if ($i++ % 2) {
          $output .= $val.';'.$newline.$newline;
        }
      }

      // If inserts are not needed we're done...
      if ($add_insert == FALSE) {
        continue;
      }

      // Grab all the data from the current table
      $query = $this->db->query("SELECT * FROM $table");

      if ($query->num_rows() == 0) {
        continue;
      }

      // Fetch the field names and determine if the field is an
      // integer type.  We use this info to decide whether to
      // surround the data with quotes or not

      $i = 0;
      $field_str = '';
      $is_int = array();
      while ($field = mysql_fetch_field($query->result_id)) {
      // Most versions of MySQL store timestamp as a string
        $is_int[$i] = (in_array(
            strtolower(mysql_field_type($query->result_id, $i)),
            array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),
            TRUE)
            ) ? TRUE : FALSE;

        // Create a string of field names
        $field_str .= '`'.$field->name.'`, ';
        $i++;
      }

      // Trim off the end comma
      $field_str = preg_replace( "/, $/" , "" , $field_str);


      // Build the insert string
      foreach ($query->result_array() as $row) {
        $val_str = '';

        $i = 0;
        foreach ($row as $v) {
        // Is the value NULL?
          if ($v === NULL) {
            $val_str .= 'NULL';
          }
          else {
          // Escape the data if it's not an integer
            if ($is_int[$i] == FALSE) {
              $val_str .= $this->db->escape($v);
            }
            else {
              $val_str .= $v;
            }
          }

          // Append a comma
          $val_str .= ', ';
          $i++;
        }

        // Remove the comma at the end of the string
        $val_str = preg_replace( "/, $/" , "" , $val_str);

        // Build the INSERT string
        $output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
      }

      $output .= $newline.$newline;
    }

    return $output;
  }

  /**
   *
   * The functions below have been deprecated as of 1.6, and are only here for backwards
   * compatibility.  They now reside in dbforge().  The use of dbutils for database manipulation
   * is STRONGLY discouraged in favour if using dbforge.
   *
   */

  /**
   * Create database
   *
   * @access	private
   * @param	string	the database name
   * @return	bool
   */
  function _create_database($name) {
    return "CREATE DATABASE ".$name;
  }

  // --------------------------------------------------------------------

  /**
   * Drop database
   *
   * @access	private
   * @param	string	the database name
   * @return	bool
   */
  function _drop_database($name) {
    return "DROP DATABASE ".$name;
  }

}

/* End of file mysql_utility.php */
/* Location: ./system/database/drivers/mysql/mysql_utility.php */